Refactor file util

lib/utils/file_util.dart

@@ -6,11 +6,13 @@ import 'package:dio/dio.dart';
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
 import 'package:flutter_image_compress/flutter_image_compress.dart';
 import 'package:photo_manager/photo_manager.dart';
+import 'package:photos/core/cache/image_cache.dart';
 import 'package:photos/core/cache/thumbnail_cache.dart';
 import 'package:photos/core/configuration.dart';
 import 'package:photos/core/constants.dart';
 import 'package:photos/db/files_db.dart';
 import 'package:photos/models/file.dart';
+import 'package:photos/models/file_type.dart';
 
 import 'crypto_util.dart';
 
@@ -26,48 +28,18 @@ Future<void> deleteFiles(List<File> files,
 }
 
 void preloadFile(File file) {
-  // TODO
-}
-
-Future<Uint8List> getBytes(File file, {int quality = 100}) async {
+  if (file.fileType == FileType.video) {
+    return;
+  }
   if (file.localID == null) {
-    if (!file.isEncrypted) {
-      return DefaultCacheManager()
-          .getSingleFile(file.getDownloadUrl())
-          .then((file) => file.readAsBytesSync());
-    } else {
-      return DefaultCacheManager()
-          .getFileFromCache(file.getDownloadUrl())
-          .then((info) {
-        if (info == null) {
-          final temporaryPath = Configuration.instance.getTempDirectory() +
-              file.generatedID.toString() +
-              ".aes";
-          return Dio()
-              .download(file.getDownloadUrl(), temporaryPath)
-              .then((_) async {
-            final data = await CryptoUtil.decryptFileToData(
-                temporaryPath, Configuration.instance.getKey());
-            io.File(temporaryPath).deleteSync();
-            DefaultCacheManager().putFile(file.getDownloadUrl(), data);
-            return data;
-          });
-        } else {
-          return info.file.readAsBytesSync();
-        }
-      });
-    }
+    _getBytesFromServer(file);
   } else {
-    final originalBytes = (await file.getAsset()).originBytes;
-    if (extension(file.title) == ".HEIC" || quality != 100) {
-      return originalBytes.then((bytes) {
-        return FlutterImageCompress.compressWithList(bytes, quality: quality)
-            .then((converted) {
-          return Uint8List.fromList(converted);
+    if (FileLruCache.get(file) == null) {
+      file.getAsset().then((asset) {
+        asset.file.then((assetFile) {
+          FileLruCache.put(file, assetFile);
         });
       });
-    } else {
-      return originalBytes;
     }
   }
 }
@@ -85,3 +57,56 @@ void preloadLocalFileThumbnail(File file) {
     });
   });
 }
+
+Future<Uint8List> getBytes(File file, {int quality = 100}) async {
+  if (file.localID == null) {
+    return _getBytesFromServer(file);
+  } else {
+    return await _getBytesFromDisk(file, quality);
+  }
+}
+
+Future<Uint8List> _getBytesFromDisk(File file, int quality) async {
+  final originalBytes = (await file.getAsset()).originBytes;
+  if (extension(file.title) == ".HEIC" || quality != 100) {
+    return originalBytes.then((bytes) {
+      return FlutterImageCompress.compressWithList(bytes, quality: quality)
+          .then((converted) {
+        return Uint8List.fromList(converted);
+      });
+    });
+  } else {
+    return originalBytes;
+  }
+}
+
+Future<Uint8List> _getBytesFromServer(File file) async {
+  if (!file.isEncrypted) {
+    return DefaultCacheManager()
+        .getSingleFile(file.getDownloadUrl())
+        .then((file) => file.readAsBytesSync());
+  } else {
+    return DefaultCacheManager()
+        .getFileFromCache(file.getDownloadUrl())
+        .then((info) {
+      if (info == null) {
+        return _downloadAndDecrypt(file);
+      } else {
+        return info.file.readAsBytesSync();
+      }
+    });
+  }
+}
+
+Future<Uint8List> _downloadAndDecrypt(File file) async {
+  final temporaryPath = Configuration.instance.getTempDirectory() +
+      file.generatedID.toString() +
+      ".aes";
+  return Dio().download(file.getDownloadUrl(), temporaryPath).then((_) async {
+    final data = await CryptoUtil.decryptFileToData(
+        temporaryPath, Configuration.instance.getKey());
+    io.File(temporaryPath).deleteSync();
+    DefaultCacheManager().putFile(file.getDownloadUrl(), data);
+    return data;
+  });
+}